B．must have been C．should be

　　D．should have 答案　B 【例31】 —Do you know what Tom is doing at the crossroads? —He ________ for his girlfriend. A．should wait

　　B．must be waiting C．can have waited

　　D．might waiting 答案　B 2．can / could多用于否定句或疑问句中，二者一般没有时间上的差异，只是could的语气更客气委婉。can't/couldn't意为“不可能”。 【例32】 I'm afraid Mr.Harding ________ see you now.He's busy.

　　(2010·全国Ⅱ) A．can't

　　B．mustn't C．shouldn't

　　D．needn't 答案　A 【例33】 —There were already five people in the car but they managed to take me as well. —It ________ a comfortable journey. A．can't be

　　B．shouldn't be C．mustn't have been

　　D．couldn't have been 答案　D 【例34】 The World Wide Web is sometimes jokingly called the World Wide Wait because it ________ be very slow. A．should

　　B．must

　　C．will

　　D．can 答案　D 3．may / might用于肯定句或否定句中，might不是may的过去式，只是might的可能性比may小。may not / mightn't意为“可能不”。 【例35】 Peter ________ come with us tonight, but he isn't very sure yet. A．must

　　B．may

　　C．can

　　D．will 答案　B 【例36】 —Is John coming by train? —He should, but he ________ not.He likes driving his car. A．must

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